/Engine/Source/Runtime/GeometryFramework/Public/Components/DynamicMeshComponent.h
If a Decomposition is set on this Component, and everything is currently valid (proxy/etc), precompute the set of buffers that will be modified, as well as the bounds of the modified region. These are both computed in parallel. UseFastNotifyTriangleVerticesUpdated_ApplyPrecompute()with the returned future to apply this precomputation.
a future that will (eventually) return true if the precompute is OK, and (immediately) false if it is not
[TFuture](API\Runtime\Core\Async\TFuture)< bool > FastNotifyTriangleVerticesUpdated_TryPrecompute ( const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & Triangles, [TArray](API\Runtime\Core\Containers\TArray)< int32 > & UpdateSetsOut, [UE::Geometry::FAxisAlignedBox3d](API\Runtime\GeometryCore\FAxisAlignedBox3d) & BoundsOut )